Why don't they buy their meat in bulk from a butcher? I don't know about North America, but where I'm from the amount of meat they sometimes buy (bacon especially) seems like something they'd get far more value from buying from a butcher and not at a supermarket, buying small pre-packaged meat. Wouldn't that stuff be about the most expensive way to buy meat? They could save some Youtube Money.
For their larger pieces of meat, they probably do. Also, note that many larger supermarkets have a butcher at them.
Muscles Glasses is a personal trainer, for God's sake! It's like a rabbi working part-time in a bacon shop!
Not to mention the fact that he's definitely gotten a bit chubby overtime. His father noted it when he was in an episode and it's been lampshaded several times.
Muscles Glasses' departures that stretch months at a time are most likely due to the fact that he absolutely has to stay on top of his weight ''because'' of his job as a trainer. This was in fact noted when in a few episodes where they note that they would normally shred cheese using his abs, but he was at the gym.
Also, in some extreme muscle gaining programs, massive caloric and protein intake is part of the diet plan. Michael Phelps was said to have a training diet of over 12,000 calories a day. The ridiculously large consumption of fat, cholesterol, sugar and alcohol are not recommended by these programs though.
And speaking of the rabbi analogy, Cousin Dave and at least one other member of the troupe are Jewish. Yet they all eat bacon. The only known food aversion for any of them is that Prince Atari hates eggs.